21424594 has 8 divisors (see below), whose sum is σ = 32168880. Its totient is φ = 10701636.

The previous prime is 21424589. The next prime is 21424619. The reversal of 21424594 is 49542412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2524 + ... + 7015.

It is an arithmetic number, because the mean of its divisors is an integer number (4021110).

Almost surely, 2^21424594 is an apocalyptic number.

21424594 is a deficient number, since it is larger than the sum of its proper divisors (10744286).

21424594 is a wasteful number, since it uses less digits than its factorization.

21424594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10664.

The product of its digits is 11520, while the sum is 31.

The square root of 21424594 is about 4628.6708675385. The cubic root of 21424594 is about 277.7394259703.

The spelling of 21424594 in words is "twenty-one million, four hundred twenty-four thousand, five hundred ninety-four".